Air conditioning conduit fitting



Sept. 24, 1940. R. E. PEcK AIR CONDITIONINGv CONDUIT FITTING Filed Apri.; 12. 1931 l INVENTOR. fat-Rr E.. Pfc-K.

ATTORNEYS.

Patented Sept. 24, 1940 UNITED STATES.'

am coNDl'rIoNnvG coNDUl'r Frr'rnvG Robert E. Peek, cincinnati, ohio Application April 12, 1937, Serial No. 136,378

4Claims.

My invention relates to the manufacture of air conditioning conduit fittings and duct turns such as elbows, 30s,. "45's", "60s, 90s and register outlets.

In the use of conduits for air conditioning vequipment such as is disclosed in my applications Serial No. 84,729 led June 11, 1936, Serial No. 84,730 iiledfJune 1l, v1936,and Serial No. 84,731, i-lled June 11, 1936, I have disclosed conduit constructions wherein the capacity and shape of the flaring walls of the fitting accommodate the steady iiow of the air currents without loss of velocity orundue friction.

It is the object fmy invention as set forth herein to provide for fittings wherein the size of the fitting and the abruptness of the turns for which provision is made, is such that a wide iiaring bend is not practical and wherein to prevent loss of velocity, vanes are inserted diagonally across the fittings which cause the currents of air moving through the conduit to bediverted without loss of velocity. f

My invention specically relates to improvements in conduit fittings for usein combination with conduit sections such as are described in my application Serial No. '84,731 iiled'June. 1l, 1936, wherein inner telescoping sections are-used to provide strong and rigid sectionjunctures.

In such a fitting it is one of my objects to utilize the straight section of conduit for making the fitting so that ttings do. not require additional patterns and equipment but maybe madeup on the job if desired where ttings are required.

It -is an object of my invention to provide a fitting which may be made from a straight section of conduit without in any way changing the edge joints of the'straight sections connected to the fittings, and which will be resistant to bursting and collapsing strain to a degree similar tothe resistance ofthe straight sections of conduit. Thus it is my object to provide assembled conduits wherein the dimensions of the fittings will correspond to the dimensions of the straight sections and where economy of construction and installation will result.

It is my object to provide a method of air duct installation in which the velocity of air .may be stepped up from 500 cu. ft. per minute, a normal velocity in metal conduits, to from 2000 to 3000 cu. ft. per minute without any disadvantage such as sound vibration.

The above objects and other structural advan- A tages and improvements I obtain by that combination'and arrangement of parts of which I have illustrated a preferred embodiment.

Referring-to the drawing: Figure 1 is a plan view with parts in sectio showing a right angle fitting extendingin a hories Fig. 3 is a plan view of a section of conduit 10 material with a. line indicating the line of cut by which a right angle fitting may be made therefrom.

Fig. 4 is a perspective view of one of the sections which is formed by cutting the section in Fig. 3 15 along the diagonal line indicated.

Fig. 5 is a perspective view of the complementary inner section only, formedfrom cutting the section shown in Fig. 3 along the diagonal line indicated.

Fig. 6 is a sectional view along the line 6 6 of Fig. 1.

Fig. '7 is a sectional view of the vane illustrated in Fig. 2 along the line 'l-l. l

Fig. 8 is a plan view of a 45.o in section.

Fig. 9 is a sectional view of a Velocity equalizing vane such as may be employed in a fitting such as is illustrated in Fig. 8.

Referring first to Fig. 3, the conduit section 30 ttnig with parts as illustrated is composed of an outer section I of iibrous material, such as asbestos, spun in com- 'poslte corrugated layers extending lengthwise of the section. The outer section I has an inner section 2 formed of compressed fibrous material 35 having suflicient rigidity and strength so that when it is telescoped into 'a position in which one end protrudes from the outer section, it will form an interlocking joint with another section of material having an inner section telescoped slightly 40 l out of registry with the outer section, so that a. recessed annular portion 3 is formed within which the protruding end of the outer section will fit.

The composite section to form a'. right angle fitting or bend is cut or sewed along the diagonal' 45 a shape corresponding to the open shape within the vane. The ends of the vane are cut v of! as indicated at 6, forming protruding end istry, and adhesive is applied to secure the meetd ing edges together.

The two outer sections la and Ib are then tted together and close the inner sections. Bands of iiexibie material t are then wrapped around the outer surface of the sections la and ib to join them securely together. It may be found advisable to secure the outer sections together by inserting metal cleats. In my application Serial No. 84,730 led June 11, 1936, I have illustrated a wide variety of cleats and fasteningl devices which will be available for securing the outer sections together. In Pig. 8 I

have illustrated a iltting of conduit in whichl the angle of bend is about 45. Such a ntting is formed in exactly the same manner as I form the 90 iitting, by cutting the composite section illustrated in Fig. 3 along the line c, d and assembling the tting in the manner described. In the 45 iltting the velocity equalizing vanes are of the shape illustratedI at 5a in Fig. 9.

I have not explained the geometric method of arriving at the curvature of the front and baci: of the velocity equalizing vanes because the formula for manufacturing such vanes is old and well known in connection with heating and ventilating engineering. The particular method of making the vanesinthe form of a. hollow shell composed of layers oi fibrous material, as far as I am advised, represents a new departure inthis art.'

Having thus described my invention, what Iv `inner and outer sections, and each having an end edge extending diagonally oi its length, said edges iitted together to form a desired angle iltting, vanes secured along the meeting edge of the inner sections tov direct air currents through the iitting and means for securely binding said two elements together.

2. A fibrous iitting for use in conduit construction comprising two elements, each having inner and outer sections, and each having an end edge extending diagonally of its length, said Aedges rltting together to form a desired angle fitting, vanes secured along the meeting edge of the inner sections to Vdirect air currents through the fitting and means for securely binding said two elements together, the edges of the inner sections opposite the meeting edges being out of registry with the edges o! the outer sections opposite the meeting edges thereof.

3; A nbrous iltting for use in conduit constructioncomprising two elements, each having inner and outer sections, and each having an end edge extending diagonally of its'length, said edges iitted together to form a desired angle tting, vanes secured along the meeting edge of the inner sections to direct air currents` through the iitting and means for securely binding said two elements together, said vanes having attachment portions and a wall of an inner section slitted along its diagonally extending edge to receive said vane attachment portion.

4; A fibrous iltting for use in conduit construction comprising two elements, each having inner and outer sections, said inner and outer sections havingend edges extending diagonally of their length, said diagonal edges ot both inner and outer sections fitted together forming a desired angular fitting, air direction vanes secured and retained in permanent position at the meeting diagonal edges of the inner sections and-means binding said two elements together.

ROBERT E. PECK. 

